A provenance test of 49 seed sources of Scots pine (Pinus
sylvestris L.) from eastern Europe, Russia, and Siberia was
established in two plantations in north-central North Dakota.
After 22 years, trees from seed sources within the region bounded
by 20° to 57° east longitude and 50° to 58° north
latitude were taller, and larger in diameter, and had denser
crown and greener winter foliage. Total height at age 5 and age
10 was highly correlated with total height at age 22, indicating
that selection at an early age (5-10 years) may be possible in
Scots pine breeding programs.